Use your favourite features in-game with our Desktop AppFlasks are consumable Items with refillable Charges in Path of Exile 2.
Note for Path of Exile 1 Players:
Flasks have been substantially overhauled in Path of Exile 2, only retaining their recovery concept for Life and Mana and refilling charges from Kills. Please read on for more details.
Flasks are Items that can be used to activate their Flask Effect. Flasks have a system that consumes a set amount of Flask Charges on use to provide their Effect - when there's not enough Charges to use the Flask, it cannot be activated. For example a 
Colossal Life Flask consumes 10 Charges upon use and has a maximum capacity of 75 Charges that can be stored.
In Path of Exile 2 there are two Flask slots by default, one for a Life Flask and one for a Mana Flask. Unlike in Path of Exile 1, Utility Flasks do not exist by name, but some Unique Life and Mana Flasks may provide Flask Effects that are somewhat similar in design.
Tip: Flasks cannot appear in Rare rarity.
Life Flasks appear in the first slot, and recover an amount of Life over the full Duration of the Flask Effect upon use. By default, the recovery from a Life Flask will be removed upon reaching Full Unreserved Life.
Note: 
Vaal Pact prevents the use of any Life Flask.
Mana Flasks appear in the second slot, and recover an amount of Mana over their full Duration upon use. By default, the recovery from a Mana Flask will be removed upon reaching Full Unreserved Mana.
Flasks have a maximum capacity of Flask Charges that can be stored. Interacting with a Well in towns will refill all Flask Charges in addition to fully restoring a character's Life, Mana and Energy Shield.
During gameplay, killing Monsters will grant Flask Charges to restore any missing Charges that have been used. The amount of Flask Charges that are gained are based on Monster Power, which is a system that takes into account Monster Rarity and difficulty to provide an appropriate amount of Flask Charges comparatively with other Monsters, and for the effort required to kill the Monster.
You can also invest into modifiers that provide a passive generation of Flask Charges, such as the use of a 
Fine Belt or 
Alchemist's Boon, or by allocating Passive Skill Tree Notables, for example 
Waters of Life or 
Staunching. Passive Charge generation can also be rolled as a Suffix modifier on Magic Life and Mana Flasks.
The base Recovery from Flasks is displayed on the Flask Item. For example a 
Lesser Mana Flask recovers 50 Mana over 2 seconds, or 25 Mana per second by default. The amount of Recovery a Flask provides can be modified by rolling specific Prefix modifiers on a Magic Flask, such as 'More Recovery if used while on Low Mana' on Mana Flasks. Additionally, Flask Quality resulting from Glassblower Bauble's will multiplicatively scale the base Recovery provided by a Life or Mana Flask.
This base Recovery amount is recovered over the full Duration of the Flask's Effect. By default when a resource reaches full, the Recovery Effect from a Flask is removed and any remaining Duration and Recovery is essentially wasted.
External modifiers can then scale this base Recovery amount in different ways. For example the Hale Traveller Notable increases Life Recovery from Flasks by 20% - this modifier improves the total amount of Recovery per second, whilst the Recovery is still provided over the same Duration. 
Oasis prevents the use of Charms, but provides a multiplicative 30% boost to Recovery from Flasks.
The base Duration of a Flask's Effect is displayed on the Flask Item. This Duration can be altered with modifiers that roll on Flasks, for example the 'increased Recovery Rate' Prefix that makes a Flask's Recovery apply over a shorter Duration, essentially improving Recovery per second but shortening how long you're under the Recovery Effect for.
External Flask Duration modifiers such as 
Savouring will then apply to the base Duration, maintaining the same total Recovery per second, but extending the lifetime of the Flask's Effect.
Support Gems such as Ambrosia and Concoct II, or the Blood Mage's 
Sanguine Tides Ascendancy Notable, can be used to essentially utilise your Mana or Life Flask Charges to improve your Damage output.
The 
Olroth's Resolve Unique Life Flask provides all of its Recovery instantly and has the special modifier 'Excess Life Recovery added as Guard for 10 seconds', making any Recovery gained from the Flask that would be wasted beyond full Life be gained as a Guard Buff instead.
Melting Maelstrom is a Unique Mana Flask that allows you to harness your Mana Costs to deal extra Damage. This Flask's Effect is not removed when your Mana is topped off, and instead remains in Effect for its full Duration.
